Comment by actuallyalys

I feel like this idea would work better at a somewhat larger scale, like a small to medium datacenter heating an apartment or office building. The downside is for any of these systems is that when it's too hot outside that heat becomes a liability so you'd have to have the infrastructure to divert heat as well. The other downside is that you'd be replacing a very well understood technology with minimal maintenance requirements with a relatively complex technology with more extensive and complex maintenance requirements.